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Examples

If \(B=126.43,\) what is the difference between \(B\) when it is rounded up to the nearest ones and B when it is rounded down to the nearest tens?

Correct Answer: 7

Solution:

Tip: Follow directions exactly.
Notice that we are to round \(126.43\) up to the nearest ones although the tenths digit is less than 5. Rounding \(12\underline{6}.43\) up to the nearest ones, \(B\) becomes 127.

Similarly, we are instructed to round 126.43 down to the nearest tens even though the ones digit is greater than 5. Rounding \(1\underline{2}6.43\) down to the nearest tens, \(B\) becomes 120.